// JavaScript Document
jQuery.extend({
    createUploadIframe: function(id, uri){
            var frameId = 'jUploadFrame' + id;
            
            if(window.ActiveXObject) {
                var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
                if(typeof uri== 'boolean'){
                    io.src = 'javascript:false';
                }
                else if(typeof uri== 'string'){
                    io.src = uri;
                }
            }else {
                var io = document.createElement('iframe');
                io.id = frameId;
                io.name = frameId;
            }
            io.style.position = 'absolute';
            io.style.top = '-1000px';
            io.style.left = '-1000px';

            document.body.appendChild(io);

            return io;   
    },
    createUploadForm: function(id, s) {
	  //create form 
		  var formId = 'jUploadForm' + id;
		  var fileId = 'jUploadFile' + id;
		  var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>'); 
		  var oldElement = jQuery('#' + s.fileElementId);
		  var datas = s.data;
		  for(var key in datas){
			  var inputtext = '<input   name="'+ key +'" id="'+ key +'" value="'+ datas[key] +'" type="hidden"  />'; 
			  jQuery(form).append(inputtext);
		  }
		  var newElement = jQuery(oldElement).clone();
		  jQuery(oldElement).attr('id', fileId);
		  jQuery(oldElement).before(newElement);
		  jQuery(oldElement).appendTo(form);
	  //set attributes
		  jQuery(form).css('position', 'absolute');
		  jQuery(form).css('top', '-1200px');
		  jQuery(form).css('left', '-1200px');
		  jQuery(form).appendTo('body');  
		  return form;
	    },
	
	    ajaxFileUpload: function(s) {
	        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout  
	        s = jQuery.extend({}, jQuery.ajaxSettings, s);
	        var id = s.fileElementId;        
		  var form = jQuery.createUploadForm(id, s);
		  var io = jQuery.createUploadIframe(id, s.secureuri);
		  var frameId = 'jUploadFrame' + id;
		  var formId = 'jUploadForm' + id;  
	        
	        if( s.global && ! jQuery.active++ ){
	   // Watch for a new set of requests
	        	jQuery.event.trigger( "ajaxStart" );
	        }            
	        var requestDone = false;
	        // Create the request object
	        var xml = {};   
	        if( s.global ){
	         jQuery.event.trigger("ajaxSend", [xml, s]);
	        }            
	        
	        var uploadCallback = function(isTimeout) {  
	   // Wait for a response to come back 
	        	var io = document.getElementById(frameId);
	            try {    
	            	if(io.contentWindow){
				      xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
				      xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
				      
				    }else if(io.contentDocument){
				    	xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
				    	xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
				    }      
	            }catch(e){
	            	jQuery.handleError(s, xml, null, e);
			   } if( xml || isTimeout == "timeout"){    
	                requestDone = true;
	                var status;
	                try {
	                    status = isTimeout != "timeout" ? "success" : "error";
	                    // Make sure that the request was successful or notmodified
	                    if( status != "error" )
	     {
	                        // process the data (runs the xml through httpData regardless of callback)
	                        var data = jQuery.uploadHttpData( xml, s.dataType );                        
	                        if( s.success )
	                        {
	       // ifa local callback was specified, fire it and pass it the data
	                         s.success( data, status );
	                        };                 
	                        if( s.global )
	                        {
	       // Fire the global callback
	                         jQuery.event.trigger( "ajaxSuccess", [xml, s] );
	                        };                            
	                    } else
	                    {
	                     jQuery.handleError(s, xml, status);
	                    }
	                        
	                } catch(e) 
	    {
	                    status = "error";
	                    jQuery.handleError(s, xml, status, e);
	                };                
	                if( s.global )
	                {
	     // The request was completed
	                 jQuery.event.trigger( "ajaxComplete", [xml, s] );
	                };
	                    
	
	                // Handle the global AJAX counter
	                if(s.global && ! --jQuery.active)
	                {
	                 jQuery.event.trigger("ajaxStop");
	                };
	                if(s.complete)
	                {
	                  s.complete(xml, status);
	                } ;                 
	
	                jQuery(io).unbind();
	
	                setTimeout(function()
	         { try 
	          {
	           jQuery(io).remove();
	           jQuery(form).remove(); 
	           
	          } catch(e) 
	          {
	           jQuery.handleError(s, xml, null, e);
	          }         
	
	         }, 100);
	
	                xml = null;
	
	            };
	        }
	        // Timeout checker
	        if( s.timeout > 0 ) 
	  {
	            setTimeout(function(){
	                
	                if( !requestDone )
	                {
	     // Check to see ifthe request is still happening
	                 uploadCallback( "timeout" );
	                }
	                
	            }, s.timeout);
	        }
	        try {
	        	var form = jQuery('#' + formId);
			   jQuery(form).attr('action', s.url);
			   jQuery(form).attr('method', 'POST');
			   jQuery(form).attr('target', frameId);
			   
	           if(form.encoding){
	                form.encoding = 'multipart/form-data';    
	           }else {    
	                form.enctype = 'multipart/form-data';
	           }   
	           console.log(form);
	           jQuery(form).submit();
		
	        } catch(e) {   
	            jQuery.handleError(s, xml, null, e);
	        }
	        if(window.attachEvent){
	            document.getElementById(frameId).attachEvent('onload', uploadCallback);
	        }else{
	            document.getElementById(frameId).addEventListener('load', uploadCallback, false);
	        }   
	        return {abort: function () {}}; 
	
	    },
	
	    uploadHttpData: function( r, type ) {
	        var data = !type;
	        data = type == "xml" || data ? r.responseXML : r.responseText;
	        // ifthe type is "script", eval it in global context
	        if( type == "script" )
	        {
	         jQuery.globalEval( data );
	        }
	            
	        // Get the JavaScript object, ifJSON is used.
	        if( type == "json" )
	        {
	        	 data = data.replace("<pre>","").replace("</pre>",""); 
	         /*eval( "data = " + data );*/
	        }
	            
	        // evaluate scripts within html
	        if( type == "html" )
	        {
	         jQuery("<div>").html(data).evalScripts();
	        }
	            
	        return data;
	    }
});
